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    SubjectRe: [fuse-devel] [PATCH] FUSE/CUSE: implement direct mmap support

    On 02/12/2010 10:53 PM, Miklos Szeredi wrote:
    > That dev_offset value is used as an offset into the server side mmap
    > address space. And yes, vma->vm_pgoff and dev_offset should be SHMLBA
    > multiples apart.


    > But don't call that _adjustment_. That's totally confusing, these are
    > *two* *different* *offsets*.

    At this point, we're completely in the realm of the babel tower.
    Unless we define all the terms explicitly, I don't think using or not
    using a single word would make much difference. Working with FUSE
    gets a bit confusing regarding which term means what but with
    multiple process address spaces and the dmmap address space and all
    the offsets, it's getting pretty ridiculous.

    > There's an alignment requirement but that's all. If they are the
    > same that is pure coincidence.
    > And dev_offset (which points into the dmmap address space) is only
    > required if the filesystem/CUSE driver needs server side mmap.

    Hmmm... w/o the dev_offset how would the server designate which area
    to use for the client?



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